Yes I know about eFuses, they were used on the Xbox 360 console as well. As far as I know, they are similar types of eFuses on the Tesla that are capable of changing their state via firmware instead of one time blow (different application) but I could be wrong. Its just in this case the thing being controlled is not a checksum for what firmware can be installed, but a checksum to confirm if current should flow to a specific path.

[1]: https://youtu.be/Hl1zEzVUV7w?t=3874